<template>
  <ul>
    <li :style="{opacity}">欢迎学习Vue</li>
    <li>news001 <input type="text"></li>
    <li>news002 <input type="text"></li>
    <li>news003 <input type="text"></li>
  </ul>
</template>
<script>
export default {
  name: 'News',
  data() {
    return {
      opacity: 1
    };
  },
  /*beforeDestroy() {
    console.log('News组件即将被销毁了');
    clearInterval(this.timer);
  },
  mounted() {
    this.timer = setInterval(() => {
      console.log('@');
      this.opacity -= 0.01;
      if (this.opacity <= 0) this.opacity = 1;
    }, 16);
  }*/
  activated() {
    console.log('News组件被激活了');
    this.timer = setInterval(() => {
      console.log('@');
      this.opacity -= 0.01;
      if (this.opacity <= 0) this.opacity = 1;
    }, 16);
  },
  deactivated() {
    console.log('News组件失活了');
    clearInterval(this.timer);
  }
};
</script>
<style lang="less" rel="stylesheet/less" scoped>
</style>